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Tracing back a second-generation star stripped from Terzan 5 by the Galactic bar by Souza, Stefano O.; Valentini, Marica; Chiappini, Cristina; Pérez-Villegas, Angeles; Montalbán, Josefina; Bossini, Diego; Barbuy, Beatriz; Elsworth, Yvonne; Garcia, Rafael A. is a scholarly article available to read on EtoBox.

What is Tracing back a second-generation star stripped from Terzan 5 by the Galactic bar about?

The Galactic bulge hosts the Milky Way's oldest stars, possibly coming from disrupted globular clusters (GCs) or the bulge's primordial building blocks, making these stars witnesses to the Galaxy's early chemical enrichment. The Galactic bar currently dominates the bulge's region, altering the orbits of objects formed before its formation and complicating the trace of the field stars' original clusters. Here, we present the discovery of a fossil record of this evolution, SOS1 -- a star trapped in the bar, exhibiting significant enhancements in nitrogen, sodium, and aluminum, typical of second-generation GC stars. SOS1 also shows an s-process Ce enhancement, suggesting an old age and early enrichment by fast-rotating massive stars in the Galaxy's earliest phases. With the purpose of finding the SOS1's parent GC, we derive its precise chemodynamical properties by combining high-precision proper motions from Gaia with APOGEE detailed chemical abundances. Our analysis suggests that SOS1 was possibly stripped from the GC Terzan 5 by the Galactic bar's gravitational influence approximately 350 Myr ago. We also found chemical similarities suggesting that SOS1 belonged to the most metal-po

Author

Souza, Stefano O.; Valentini, Marica; Chiappini, Cristina; Pérez-Villegas, Angeles; Montalbán, Josefina; Bossini, Diego; Barbuy, Beatriz; Elsworth, Yvonne; Garcia, Rafael A.

Published

2024

Language

EN